I've got a Ernst but I've only seen a couple of his painting 'in the flesh' but his later stuff especially is amazing for using sort of odd techniques'. i think there's frottage, and grottage but i can't off the top of my head remember what the difference is.

I think he is getting a lot of attention for this mental clock thing he's done. It's not a BAD show, but I thought there was a fair amount of dross in there to be honest. I think its about £8 - less if you are a student.